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Construction of a standard velocity structural madel and a standard wave propagation madel in Japan

日本标准速度结构模型和标准波传播模型的建造

基本信息

批准号：
15204039
负责人：
TSURUOKA Hiroshi
金额：
$ 19.3万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15204039/
关键词：
Earthquake Environment Japanese Islands 3D velocity model realtime monitoring database wave propagation ground motions

项目摘要

We compiled and developed a standard 3-D velocity structure model (velocity, density and Q ) in Japanese Islands to understand long-period ground motions. Then we calculate ground motions (or waveforms) by mean of FDM and three-dimensional Born kernels using this velocity structure model. Also, we operate PC-based analysis system to continuously monitor long-period (20-50 sec) seismic wavefield to simultaneously determine origin time, location and seismic moment tensor of seismic in realtime(GRiD MT : Grid-based RealtIme Determination of Moment Tensors URL : http : //wwweic.eri.u-tokyo.ac.jp/GRiD MT/).Summary is as follows :(1) We analyzed waveform data from a dense nation-wide strong-motion network (K-NET and KiK-net) for SE Off-Kii Peninsula (Mw7.4) earthquake of 5 September 2004 that occurred within then Nankai Trough. The observational data and a corresponding computer simulation using this velocity structure model clearly demonstrate that long-period ground motion.(2) A whole mantle SH velocity model is obtained by using a unique data set and technieues of 3-D Born kernels.(3) GRiD MT detects earthquakes and determines the source parameters with a high level of precision and complete automation within three minutes of the earthquake occurrence.

我们编制和开发了一个标准的三维速度结构模型（速度，密度和Q）在日本列岛了解长周期地面运动。然后，我们计算的地面运动（或波形）的FDM和三维玻恩核使用该速度结构模型。此外，我们操作基于PC的分析系统来连续监测长周期（20-50秒）地震波场，以同时实时确定地震的起源时间、位置和地震矩张量（GRiD MT：Grid-based RealtIme Determination of Moment Tensors URL：http：//wwweic.eri.u-tokyo.ac.jp/GRiD MT/）。（1）分析了全国范围内密集强震台网的波形资料2004年9月5日发生在当时的南海海槽内的东南近海半岛（Mw7.4）地震的K-NET和KiK-NET。观测数据和相应的计算机模拟使用该速度结构模型清楚地表明，长周期地面运动。(2)本文利用一套独特的资料和三维玻恩核技术，建立了一个全地幔SH速度模型。(3)GRiD MT在地震发生后三分钟内以高精度和完全自动化的方式检测地震并确定震源参数。